1. Department of Neurology, Tangshan Gongren Hospital, Tangshan, Hebei 063000, P.R.�China
2. Department of Neurology, Tangshan Gongren Hospital, Tangshan, Hebei 063000, P.R. China
3. Department of Neurology, Zunhua People's Hospital, Tangshan, Hebei 064200, P.R. China
4. Department of Neurosurgery, Tangshan Gongren Hospital, Tangshan, Hebei 063000, P.R. China
5. Department of Radiotherapy and Chemotherapy, Tangshan Gongren Hospital, Tangshan, Hebei 063000
6. Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei 050000, P.R.�China